Sony sa w 55 x service manual

Page 2

SA-W55X

SAFETY CHECKOUT

After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:

Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 05 mA (500 mieroampers). Leakage
current can be measured by any one of three
methods. '

l. A commercial leakage tester, such as the
Simpson 229 or RCA WT-54OA. Follow the
manufacturers instructions to use these instru-
ments.

2. A battery~operated AC millianiineter. The Data
Precision 245 digital multimeter is suitable for
this job.

3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt.
meter, The limit" indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Fan: on Set

I Ac
0.15uF €75 kit voltmeter
(0.75 V}

'7" Earth Ground

Fig. A, Using an AC vo/tmeter to check AC leakage,

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BV SONY.

- MODEL IDENTIFICATION -
(Specification Label)

SONY® MODEL NO. SA-W55X
ACTIVE SUPER WOOFER

SERIAL No.
MADE IN JAPAN

US model : AC: 120V 60Hz 90W
Canadian model :AC: 120V 60 Hz 120W
AEP model : AC:220 - 230 V ~ 50/60 Hz
E12 model :ACIZZO-ZAOV ~ 50/60 HZ 90W
E23 model :AC:110- 120V .. SO/GOHZ 90W
UK model : AC:240V ~ 50/60 Hz

ATTENTION AU COMPQSANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS IoENTIFIEs PAR UNE MARQUE [5
sun LES DIAGRAMMES sCI-IEMATIQUEs ET LA LIsTE
DES PIECES s0NT cmTIouEs POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES com
POSANTS QUE PAR DES PIECES sonv DONT LES
NUMERos SONT DONNEs DANS CE MANUEL ou
DANS LES SUPPLEMENTS Puaués PAR SONY.